For some people they might talk about people founding out about a different side of them from say leaving things around, an item in the post arriving when they were not around or some scribbled note.
For me it wasn't really like this because my Mom actually knew a had very child-like side that went into how I acted, what my likes and dislikes were and that it included dressing more that age including dressing more like a school aged girl in a uniform.

I had scarcely grown up, she had spotted me wearing odd things from my earlier years in school as I was moving toward school leaving age even so it was no surprise to her seeing me looking more like the girl on the left. All I ever wanted was her life forever anyway.